一、引言近年来,一种抗干扰能力强的新型雷达系统正在国内研制,其发射机的末级有十～几十千瓦输出功率的行波管放大器,需要瓦级功率来推动。以前采用一级行波管放大器来实现,它需要几组几千伏的高压电源,因此设备复杂庞大、耗电多、寿命短、机动性和可维护性较差,迫切需要一种固态功率放大器件来代替。而国内其他固态器件尚达不到要求,如双极晶 I. INTRODUCTION In recent years, a new type of radar system with strong anti-jamming capability is being developed in China. The last stage of the transmitter has a TWT amplifier with output power of ten to several tens of kilowatts and needs watt-class power to promote. The previous use of a traveling wave tube amplifier to achieve, which requires several sets of thousands of volts of high-voltage power supply, so the device is complex, large power consumption, short life, mobility and maintainability is poor, there is an urgent need for a solid-state power amplifier Pieces instead. Other domestic solid-state devices are still not up to the requirements, such as bipolar crystal